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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 30, issue 1
Ann. Geophys., 30, 119-130, 2012
https://doi.org/10.5194/angeo-30-119-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 30, 119-130, 2012
https://doi.org/10.5194/angeo-30-119-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 13 Jan 2012

Regular paper | 13 Jan 2012

Electron-cylotron maser radiation from electron holes: downward current region

R. A. Treumann1,2, W. Baumjohann3, and R. Pottelette4 R. A. Treumann et al.
  • 1Department of Geophysics and Environmental Sciences, Munich University, Munich, Germany
  • 2Department of Physics and Astronomy, Dartmouth College, Hanover NH 03755, USA
  • 3Space Research Institute, Austrian Academy of Sciences, Graz, Austria
  • 4LPP-CNRS/INSU, 94107 Saint-Maur des Fossés, France

Abstract. The electron-cyclotron maser emission theory from electron holes is applied to holes generated in the downward current region of the aurora. It is argued that the main background auroral kilometric radiation source may still be located in the upward current region electron-ring (horseshoe) distribution while the fine structure is caused by electron holes predominantly in the downward current region. There the existence of electron holes is well established and electron densities are high enough for substantial maser growth rates. Trapping of radiation by the holes provides strong amplification. Upward motion of holes favours the escape of radiation both, from the holes and from the downward current region, into the upward current region. Since upward and downward current regions always exist simultaneously, they are acting in tandem in generating auroral kilometric radiation and its fine structure by the same mechanism though in different ways. This mechanism solves the long-standing problem of auroral kilometric radiation fine structure.

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